Reasonable Scope of Kilometer Drilling in Lower Layer of Extrathick Coal Seam: A Case Study of Tingnan Coal Mine, China

Figure 13

Contour map of displacement of the section along the tendency direction. (a) 3 m from coal seam of working face. (b) 5 m from coal seam of working face. (c) 7 m from coal seam of working face. (d) 9 m from coal seam of working face.

(a)

(b)

(c)

(d)